Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b4b837e6872e71d…

MALICIOUS

PDF

92.1 KB Created: 2021-09-13 18:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 51b26d10641bc914e9501df956fd2325 SHA-1: 30c4867a0d0374abd7d205fdd2c8b377fb58c76b SHA-256: 0b4b837e6872e71d05ee0139f2f3213068ee4d5010a761953169325b5f641d03
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs that point to disposable domains, characteristic of a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a malicious tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://oniceh.ru/uplcv?utm_term=how+to+screenshot+record+on+android PDF link annotation
    • https://martas.vodrsport.cz/uploads/files/42523664484.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210901233106.pdfIn PDF document text
    • https://netpage.info/userfiles/file/25523473282.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/42559850292.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/dixafino.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/57334584450.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/95965800631.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/vifixevu.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210906022235.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/vamimowakol.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/lenaneri.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/lasig.pdfIn PDF document text
    • http://geose.ru/userfiles/file/78318169701.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/kumizerusefanexiravo.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/suniwuvoduniduzib.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/kupivogojepikipizofo.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/31951315092.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/78724679833.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/27640794124.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334869d212f---totizu.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/jaloxibupum.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001034c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034C 18296 bytes
SHA-256: 2744c723330c4b0e86a40c095c7544ac57a4fe6b510e0648f3c751614135391d
font_01_sfnt_off000132cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AE3 10496 bytes
SHA-256: 127c6a945eee8762158a49f1c6c8a15866c69fc03cc8046f2e92b14b95b8546c

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